发明名称 |
Coupling for interconnecting pipe sections, and pipe section for well drilling operations. |
摘要 |
<p>Screw thread couplings for pipe sections in well drilling operations are provided with locking shoulders (V) for locking the couplings against loosening due to impacts exerted thereon. The shoulders co-operate with means for guiding the locking shoulders (V) to their locking position at the end of the coupling operation.</p> |
申请公布号 |
EP0032265(A1) |
申请公布日期 |
1981.07.22 |
申请号 |
EP19800201222 |
申请日期 |
1980.12.19 |
申请人 |
SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V. |
发明人 |
ZIJLSTRA, KORNELIS NANNO |
分类号 |
E21B17/043;F16L15/00;(IPC1-7):21B17/043 |
主分类号 |
E21B17/043 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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